Valve mechanism for carbureters.



W. S. GUTHRIE.

VALVE MECHANISM FOR GARBURETERS.

APPLICATION FILED JUNE 25, 1910.

Patented June 18, 1912.

VII/ll NVENTOR ATTORNEY UNITED, STATES "PATENT; OFFICE.

i WILLIAM S. GUT-HBIE, OI TEBRELL, TEXAS.

VALVE LIEGHANISH FOB CARBUBE'IERS.

Specification of Letters 1mm.

Application filed June 25, 1910. Serial No. 568,905.

Patented une 18, 191 2.

To all whom it may concern:

Be it known that I, WILLIAM S. Gn'rnnm, a citizen of the United States, residing at Terrell, in the count of Kaufman and State of Texas, have mvented a new and useful Valve Mechanism for Carbureters, of which the following is a specification.

The invention relates to improvements in valve mechanism for carbureters for use on internal combustion engines.

The object of the present invention is to provide a simple, eflicient and practical valve mechanism, equipped with a fuel valve controlling a fuel supply and ciperating with a short stroke of only su cient movement to supply the desired amount of fuel and without affecting the draft of the engine, whereby the fuel valve is prevented from hammering its seat or interfering with the free passage of the mixture of air and fuel. 1

A further object of the invention is to provide a valve mechanism, having a fuel valve and provided with a fluid valve controlling the opening of the fuel valve, and having a constant suction controlled travel unaffected by the amount of movement of the fuel valve or any adjustment thereof.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various chan es in the form, proportion, size and details of constru. Jion, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings :-'-Figure 1 is a vertical sectional view of a carburetor including Fig. 3 is a similar view on the line 3-3 of T Fig. 1.

Like numerals of reference designate corresponding parts all the figures of the drawings.

In the embodiment of the invention illustrated in Figs. 1 to 3 of the accompanying drawings, the valve casing is com osed of upper and lower sections 1 and 2, t e upper section being of elbow formation and proteriorly recessed at its upper end to receive the lower end of the upper section of the casing for arranging .the parts in flush relation.

The valve casing may be modified in a variety of ways, but in the accom anying drawings I have shown only one orm of valve casing. The projecting portion 4 of the lower section has an inner cylindrical face and forms a cylindrical passage-way, which is controlled by a fluid valve 5 of circular form, provided with a vertical tubularstem 6 and arranged to receive vertical stem 7 of a fuel valve 8. The fluid valve 5 is provided at its periphery with a depending exteriorly beveled annular flange 9, forming a tapering periphery and adapted when the valve 1s raised to provide an opening for the passage of mixture to the engine. The tubular valve stem 6 is provided with a depending extension 10, operating in a lower "web or spider guide 11, said guide being arranged in the casing below the fluid valve and above the seat or upper end of the fuel passage and said extension engaging a collar 12 of the fuel valve to seat the same against a valve seat 12. The fluid valve is held against rotary movement in the guide by a pin 5 arranged to engage the guide. By employing the lower central tubular guide, which is arranged between v the seat for the fuel valve and the fluid valve, the latter is enabled to operate within the cylindrical ortion of the casing without actually toucl iing the walls thereof, so that the friction, which would result from the peripheral contact and a eripheral guide, is eliminated, and the sticking of the valve is effectually prevented. Also the noise, which is sometimes caused by peripheral guiding means, is prevented. The valve seat 12, which is arranged at the upper end of a vertical fuel'passage 13 and which forms a projecting nozzle, is provided with a reduced threaded portion 14, which engages an interiorly threaded socket or recess 15 at the upper end of the said passage. This enablesthe valve seat to be readily removedand replaced, but the valve seat may be integral with a vertical tubular portion 16, forming the walls of the" passage 13.

In practice the fuel suppl me. be located at a. higher elevation t ant e valve to roduce a gravity feed, thereby automate cal y primin the carbureter on turning the engine cran and lessening the cranking of the engine. The upper portion of the tubular valve stem of the fluid valve is arranged in an upper tubular guide 17, formed. in-

tegral with the upper section of the casing and depending from the top wall thereof. The stem 7 of the fuel valve extends through the tubular stem of the fluid valve and pro- ;jects abOWE the same and. is adapted to have 'its movement limited by an adjusting screw 18, which is mounted at the upper or outer end of the tubular guide but in practice the diameter of the fuel supply passage and the size of the air inlet openings 19 can be made precise, so that no adjusting device will be required. The adjusting screw 18 is mounted at the upper or outer end of'the tubular guide 7. It is preferable, however,

to employ an adjusting device for enablingthe fuel valve to be adjusted to suit the varying conditions of the temperature, at-

mosphere, etc. The adjusting screw 18 is equip ed with a lock nut 20 for securing it in Its adjustment. Various other forms of adjusting devices may be employed for limiting the movement of the fuel valve and varying the length of the stroke of the same.

A coiled spring 21 is arranged on the tubular stem 6 and interposed between the lower end of the upper guide 17 and the fluid valve for urglng the latter downwardly to hold the same against the collar 12 to seat the fuel valve. The fluid valve is not seated, and operates in opening to separate or depart from the cylindrical portion of the casing. This enables the fluid valve to close the fuel valve andcontrol the opening of the same. The fluid valve is opened vby the suction created by the piston in the cylinder of the engine, and the valve casing increases in diameter above the cylindrical portion 4, which receives the fluid valve.

This will permit the mixture of air and gasolene or other fuel to readily pass by or around the fluid valve through the valve casing. The suction also operates to open the fuel valve, but it is preferable to interpose a coiled spring 22 between the collar 12 and the valve seat to actuate or assist in actuating the fuel valve in the opening movement thereof. When the fluid valve is opened through suction, it releases the fuel valve, which is limited in its opening movement by the adjusting screw 18, and it will be clear that the limiting of the opening of the fuel valve and the adjustment thereof does not affect the opening movement of the I,

fluid valvefor a given suction and the said i fluid valve, after releasln the fuel valve, operates independently t ereof so as to maintain a constant suction controlled travel. This prevents any adjustment of the fuel valve from affecting the draft of the engine. The spring 22 owing to its particular arrangement does not resist the opening movement of the fluid valve, but operates to assist the opening movement of the same.

When the fuel valve is open, its tapered lower end is arranged in spaced relation with the fuel passage and it operates to spray the gasolene, or other fuel to cause the same to mix thoroughly with the air, and in order to increase the mixing of the fuel and the air, the

air passage of the valve casing is constricted at the fuel valve to brin the air closer to the fuel and to increase t e rapidity of the currentof air produced by the suction of the engine. This is preferably effected by making the lower section hollow to form an inner wall 23 and an outer wall. The inner wall is approximately V-shaped in vertical section to constrict or contract the air passage around the fuel valve, and the intervening space 24 between the inner and outer walls of the hollow section of the casing is designed to be utilized as a water jacket, suitable inlet and outlet openings 25 and 26 being provided for this purpose.

The air inlet openings 19. are formed in a disk 27 and are arranged in an annular series, and are adapted to cooperatewith openings 28 of an adjustable disk or closure 29,- mounted on the tubular portion 16 at the lower or outer face of the disk 27 valve 34 of the usual construction, and the v terminal portion of the valve casing may be constructed in any manner to adapt it for the particular engine with which it is'to be used.

In the foregoing description I have particularly set forth certain details of construction for the purpose of conveying a clear understanding of my invention, but it is my purpose to define in the claims the exact scope of my invention.

Having thus. fully described my invention, what I claim as new and. desire to secure by Letters Patent, is

1. A valve mechanism for carbureters including a fuel valve, means for opening the rovided with curved slots 30 and 31 noaaeoe same, adjusting means for limiting the travel of the fuel valve, and a suction controlled fluid valve arranged in closing to actuate the fuel valve to positively close the same, said fluid valve having a free opening movement independent of the length of travel of the fuel valve and unresisted by the adjustments ofthe latter, whereby the stroke of the fuel valve may be shortened to any eX tent without retarding the fluid valve as in fiuenced by suction.

2. A valve mechanism for cabureters i neluding a valve casing having an air passage and provided therein with a fuel passage, a fuel valve arranged to seat itself on the end of the fuel passage and having a stem, an adjusting device for limiting the .movement of the fuel valve, a suction confuel valve, whereby the stroke of the fuel valve may be shortened to any desired extent without retarding the fluid valve as influenced by suction, guiding means for the fluid valve, and a spring for actuating the fluid valve in the closing movement thereof.

3. A valve mechanism for earbureters including a valve casing having an air passage and provided therein with a fuel passage, a fuel valve arranged to seat itself on the end of the fuel passage and having a vertical stem, a stop located above the stem of the fuel valve for limiting the opening movement of the latter, a suction controlled fluid valve having a vertical tubular stem receiving and guiding the stem of the fuel valve, said tubular stem being extended below the fluid valve and arranged to actuate the fuel valve in the closing movement thereof, and a tubular guide located between the fluid valve and the end of the fuel passage and receiving and guiding the lower'portion of the stem of the fuel valve.

4. A valve mechanism for earbureters including a valve casing having an air passage and provided therein with a fuel passage, a fuel valve arranged to seat itself on the end of the fuel passage and having-a stem, a suction controlled fluid valve having a tubular stem receiving and guiding the stem of the fuel valve, said fluid valve being arranged to actuate the fuel valve in the closing movement thereof, a tubular guide extending from the wall of the casing and receiving one end of the tubular stem of the fluid valve, an adjusting device mounted at the outer end of the tubular guide and forming a stop for the stem of the fuel valve to limit the opening movement of the latter, and a separate guide located between the fluid valve and the end of the fuel passage and guiding the lower end of the said tubular stem.

5. A. valve mechanism for earbureters including a valve easing having an air passage and provided therein with a fuel passage, a fuel valve arranged to seat itself on the end of the fuel passage and having a stem, a suction controlled fluid valve having a tubular stem receiving and guiding the stem of the fuel valve, said fluid valve being arranged to actuate the fuel valve in the closing movement thereof, a guide located between the fuel passage and the fluid valve and receiving and gulding the said tubular stem, and means for preventing rotary movement of the latter.

In testimony, that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

WILLIAM S. GUTHRIE.

Witnesses:

A JOHN H. Sreonns,

DAVID R. WAGNER. 

